Evaluation of the Degradation of Fiber Composites by Integrated Structural Health Monitoring

通过综合结构健康监测评估纤维复合材料的降解

• 批准号: 246293183
• 负责人: Professor Dr.-Ing. Rolf Lammering
• 金额: --
• 依托单位: Professur für Mechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/246293183?language=en
• 关键词: Evaluation; Degradation; Fiber; Composites; Integrated

The degradation of fiber-reinforced polymers due to cyclic loading is associated with micro defects in the material. Within this project, the implications of micro defects on the propagation of Lamb waves will be investigated. The first objective is to capture qualitatively the effects of micro defects, which are characteristic for fiber-reinforced plastics but not relevant to immediate failure, and the related material degradation on the characteristic properties of Lamb waves. The experimental investigations will analyze the degradation influence on characteristic parameters of the linear wave theory, such as the group velocity, and include the non-linear defect behavior, which is caused e.g. by the interaction of crack surfaces and which may be described by the acoustic nonlinear parameter. It is assumed that reference measurements from undamaged specimens have to be available. The second, far-reaching objective aims at the quantification of these effects. The related experiments address the question whether the extent of the degradation and thus the extent of the damage can be assessed by changes of those parameters, which describe the propagation behavior of Lamb waves.

纤维增强聚合物在循环载荷作用下的降解与材料中的微观缺陷有关。在这个项目中，微观缺陷对兰姆波传播的影响将被调查。第一个目标是捕获定性的微观缺陷，这是纤维增强塑料的特性，但不相关的即时故障，以及相关的材料退化的特征性质的兰姆波的影响。实验研究将分析退化对线性波理论的特征参数（例如群速度）的影响，并且包括例如由裂纹表面的相互作用引起的并且可以由声学非线性参数描述的非线性缺陷行为。假设必须提供未受损试样的参考测量值。第二个意义深远的目标是量化这些影响。相关的实验解决的问题，是否可以通过这些参数的变化，描述的传播行为的兰姆波的退化的程度，从而评估的损害程度。

项目成果

Numerical simulation of elastic wave propagation in isotropic media considering material and geometrical nonlinearities

• DOI: 10.1088/0964-1726/24/4/045027
• 发表时间: 2015-04
• 期刊: Smart Materials and Structures
• 影响因子: 4.1
• 作者: N. Rauter;R. Lammering

A constitutive model for the analysis of second harmonic Lamb waves in unidirectional composites

• DOI: 10.1016/j.ijsolstr.2017.11.019
• 发表时间: 2017-11
• 期刊: International Journal of Solids and Structures
• 影响因子: 3.6
• 作者: N. Rauter;R. Lammering

Impact Damage Detection in Composite Structures Considering Nonlinear Lamb Wave Propagation

• DOI: 10.1080/15376494.2014.907950
• 发表时间: 2015-01-01
• 期刊: MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
• 影响因子: 2.8
• 作者: Rauter, Natalie;Lammering, Rolf
• 通讯作者: Lammering, Rolf

On the detection of fatigue damage in composites by use of second harmonic guided waves

• DOI: 10.1016/j.compstruct.2016.05.049
• 发表时间: 2016-09-15
• 期刊: COMPOSITE STRUCTURES
• 影响因子: 6.3
• 作者: Rauter, Natalie;Lammering, Rolf;Kuehnrich, Tim
• 通讯作者: Kuehnrich, Tim